/Engine/Source/Developer/ScreenShotComparisonTools/Public/ImageComparer.h
ReportRootDirectory is where all reports are saved. E.g./Saved/Automation/Reports ReportFile is a specific report for a test under this path. E.g./Saved/Automation/Reports/Test/TestName/report.json.
FComparisonReport ( const [FString](API\Runtime\Core\Containers\FString) & InReportRootDirectory, const [FString](API\Runtime\Core\Containers\FString) & InReportFile )